CN215374296U - Automatic calibration system for PLC (programmable logic controller) thermal resistance module - Google Patents
Automatic calibration system for PLC (programmable logic controller) thermal resistance module Download PDFInfo
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- CN215374296U CN215374296U CN202121569722.0U CN202121569722U CN215374296U CN 215374296 U CN215374296 U CN 215374296U CN 202121569722 U CN202121569722 U CN 202121569722U CN 215374296 U CN215374296 U CN 215374296U
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Abstract
The utility model provides an automatic calibration system of a PLC thermal resistance module, which comprises: the precise low-temperature drift resistors are connected in series in sequence and have preset quantity; the relays are in one-to-one correspondence with the precise low-temperature drift resistors and are connected to two ends of the corresponding precise low-temperature drift resistors in parallel; the PLC digital quantity output module is used for controlling the on-off of the relay so as to set the resistance value of the serially connected precise low-temperature drift resistor; the precise LRC digital bridge is used for acquiring the resistance value of the serially connected precise low-temperature drift resistor; a multi-channel thermal resistance temperature measurement module; and the PLC main controller is used for calibrating the resistance information of the multi-channel thermal resistance temperature measurement module according to the resistance value set by the PLC digital quantity output module and the resistance value acquired by the precise LRC digital bridge. The automatic calibration system for the PLC thermal resistance module realizes the production calibration of the thermal resistance module in an automatic mode, and can effectively improve the precision and consistency of the thermal resistance module.
Description
Technical Field
The utility model relates to the technical field of device calibration, in particular to an automatic calibration system for a thermal resistance module of a Programmable Logic Controller (PLC).
Background
The PLC is a digital operation electronic system designed for application in industrial environments, and employs a programmable memory in which instructions for performing operations such as logic operation, sequence control, timing, counting, and arithmetic operation are stored, and various types of mechanical devices or production processes are controlled by digital or analog input and output.
Thermal resistance (thermal resistor) is the most commonly used temperature detector in the middle and low temperature region, and is used for measuring temperature based on the characteristic that the resistance value of a metal conductor increases along with the increase of temperature, and has the advantages of high measurement precision and stable performance. Therefore, the thermal resistor is not only widely used for industrial temperature measurement, but also made into a standard reference instrument.
In the field of industrial PLC technology, thermal resistance modules play a very important role. Therefore, accurate measurement of the thermal resistance module is of great significance. In the prior art, the thermal resistance module is usually calibrated manually. The above calibration method has the following disadvantages:
(1) the precision of manual calibration is not high and consistency is lacked;
(2) the manual calibration time is long, and the production efficiency is seriously influenced.
SUMMERY OF THE UTILITY MODEL
In view of the above drawbacks of the prior art, an object of the present invention is to provide an automatic calibration system for a PLC thermal resistance module, which uses an automated method to realize production calibration of the thermal resistance module, and can effectively improve the precision and consistency of the thermal resistance module.
To achieve the above and other related objects, the present invention provides an automatic calibration system for a PLC thermal resistance module, including: the precise low-temperature drift resistors are connected in series in sequence and have preset quantity; the relays are in one-to-one correspondence with the precise low-temperature drift resistors and are connected to two ends of the corresponding precise low-temperature drift resistors in parallel; the PLC digital quantity output module is connected with the relay and is used for controlling the on-off of the relay so as to set the resistance value of the serially connected precise low-temperature drift resistor; the precise LRC digital bridge is connected with two ends of the serially connected precise low-temperature drift resistors and is used for collecting the resistance value of the serially connected precise low-temperature drift resistors; the multi-channel thermal resistance temperature measurement module is connected with two ends of the serially connected precise low-temperature drift resistor; the PLC main controller is connected with the PLC digital quantity output module, the multi-channel thermal resistance temperature measurement module and the precise LRC digital bridge and is used for calibrating the resistance information of the multi-channel thermal resistance temperature measurement module according to the resistance value set by the PLC digital quantity output module and the resistance value acquired by the precise LRC digital bridge; and the two channel selection relays are connected with the PLC digital quantity output module, are respectively connected with two ends of the serially connected precise low-temperature drift resistors, and are used for connecting the two ends of the serially connected precise low-temperature drift resistors to a channel to be verified of the multi-channel thermal resistor temperature measurement module under the control of the PLC digital quantity output module.
In an embodiment of the present invention, the PLC main controller is connected to the precise LRC digital bridge through a serial port.
In an embodiment of the present invention, the PLC main controller and the precision LRC digital bridge are connected via an ethernet.
In an embodiment of the present invention, the multi-channel thermal resistance temperature measurement module adopts a six-channel thermal resistance temperature measurement module.
In an embodiment of the utility model, the PLC main controller is connected to the multichannel thermal resistance temperature measurement module through a PLC internal bus.
In an embodiment of the present invention, the PLC main controller is connected to the PLC digital output module through a PLC internal bus.
As described above, the PLC thermal resistance module automatic calibration system of the present invention has the following advantageous effects:
(1) the thermal resistance module is calibrated through an automatic calibration system, so that the precision and the consistency of the thermal resistance module are effectively improved;
(2) simplifies the production process, improves the production efficiency and has high practicability.
Drawings
Fig. 1 is a schematic structural diagram of an automatic calibration system for PLC thermal resistance modules according to an embodiment of the present invention.
Description of the element reference numerals
1 precision low temperature drift resistor
2 Relay
3 PLC digital quantity output module
4 accurate LRC digital bridge
5 multichannel thermal resistance temperature measurement module
6 PLC Main controller
7 channel selection relay
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The automatic calibration system for the PLC thermal resistance module performs automatic production calibration of the thermal resistance module through a PLC technology, can effectively improve the precision and consistency of the thermal resistance module, simplifies production procedures, improves production efficiency, and has high practicability.
As shown in fig. 1, in an embodiment, the PLC thermal resistance module automatic calibration system of the present invention includes:
the precise low-temperature drift resistors 1 are connected in series in sequence, and are used for simulating specific precise resistance values, such as the resistance values of the thermal resistors PT100 and PT 1000. The precision low-temperature drift resistor is an ultra-high precision resistor product, the highest precision is 0.01%, and the lowest temperature drift is 5 ppm.
And the relays 2 are in one-to-one correspondence with the precise low-temperature drift resistors 1, and the relays 2 are connected in parallel at two ends of the corresponding precise low-temperature drift resistors 1.
And the PLC digital output module 3 is connected with the relay 2 and is used for controlling the on-off of the relay 2 so as to set the resistance value of the serially connected precise low-temperature drift resistor 1. Specifically, when a relay is controlled to be closed, the precise low-temperature drift resistor corresponding to the relay is short-circuited, and when a relay is controlled to be opened, the precise low-temperature drift resistor corresponding to the relay is normally connected in series. Therefore, the resistance value of the series-connected precise low-temperature drift resistor can be controlled by opening and closing the relay 2. Preferably, the PLC digital output module 3 controls the relay 2 to make the serially connected precise low-temperature drift resistor 1 simulate the resistance of the thermal resistor PT100 or PT 1000.
And the precise LRC digital bridge 4 is connected with two ends of the serially connected precise low-temperature drift resistor 1 and is used for acquiring the resistance value of the serially connected precise low-temperature drift resistor. The precise LRC digital bridge is an instrument capable of measuring inductance, capacitance, resistance and impedance, and can precisely measure the resistance value of the serially connected precise low-temperature drift resistor 1 by connecting with two ends of the serially connected precise low-temperature drift resistor 1.
And the multi-channel thermal resistance temperature measurement module 5 is connected with two ends of the serially connected precise low-temperature drift resistor 1. In an embodiment of the present invention, the multi-channel thermal resistance temperature measurement module 5 is a six-channel thermal resistance temperature measurement module.
And the PLC main controller 6 is connected with the PLC digital quantity output module 3, the multi-channel thermal resistance temperature measurement module 5 and the precise LRC digital bridge 4 and is used for calibrating the resistance information acquired by the multi-channel thermal resistance temperature measurement module 5 according to the resistance value set by the PLC digital quantity output module 3 and the resistance value acquired by the precise LRC digital bridge 4. Specifically, the PLC main controller 6 outputs resistance information to the multichannel thermal resistance temperature measurement module 5 according to the set resistance value and the collected resistance value, so as to calibrate the resistance value of the multichannel thermal resistance temperature measurement module 5.
Because the multichannel thermal resistance temperature measurement module comprises a plurality of channels, when each channel needs to be calibrated, two channel selection relays 7 need to be arranged. The two channel selection relays 7 are connected with the PLC digital quantity output module 3, respectively connected with two ends of the serially connected precise low-temperature drift resistor 1, and used for connecting two ends of the serially connected precise low-temperature drift resistor 1 to a channel to be checked of the multi-channel thermal resistor temperature measurement module 5 under the control of the PLC digital quantity output module 3.
In an embodiment of the present invention, the PLC main controller 6 is connected to the precise LRC digital bridge 4 through a serial port or an ethernet, and the transmission of the collected resistance value is completed.
In an embodiment of the present invention, the PLC main controller 6 is connected to the multichannel thermal resistance temperature measurement module 1 and the PLC digital output module 3 through a PLC internal bus to complete information transmission.
In conclusion, the automatic calibration system for the PLC thermal resistance module calibrates the thermal resistance module through the automatic calibration system, so that the precision and the consistency of the thermal resistance module are effectively improved; simplifies the production process, improves the production efficiency and has high practicability. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a PLC thermal resistance module automatic calibration system which characterized in that: the method comprises the following steps:
the precise low-temperature drift resistors are connected in series in sequence and have preset quantity;
the relays are in one-to-one correspondence with the precise low-temperature drift resistors and are connected to two ends of the corresponding precise low-temperature drift resistors in parallel;
the PLC digital quantity output module is connected with the relay and is used for controlling the on-off of the relay so as to set the resistance value of the serially connected precise low-temperature drift resistor;
the precise LRC digital bridge is connected with two ends of the serially connected precise low-temperature drift resistors and is used for collecting the resistance value of the serially connected precise low-temperature drift resistors;
the multi-channel thermal resistance temperature measurement module is connected with two ends of the serially connected precise low-temperature drift resistor;
the PLC main controller is connected with the PLC digital quantity output module, the multi-channel thermal resistance temperature measurement module and the precise LRC digital bridge and is used for calibrating the resistance information of the multi-channel thermal resistance temperature measurement module according to the resistance value set by the PLC digital quantity output module and the resistance value acquired by the precise LRC digital bridge;
and the two channel selection relays are connected with the PLC digital quantity output module, are respectively connected with two ends of the serially connected precise low-temperature drift resistors, and are used for connecting the two ends of the serially connected precise low-temperature drift resistors to a channel to be verified of the multi-channel thermal resistor temperature measurement module under the control of the PLC digital quantity output module.
2. The PLC thermal resistance module auto-calibration system of claim 1, wherein: and the PLC main controller is connected with the precise LRC digital bridge through a serial port.
3. The PLC thermal resistance module auto-calibration system of claim 1, wherein: and the PLC main controller is connected with the precise LRC digital bridge through an Ethernet.
4. The PLC thermal resistance module auto-calibration system of claim 1, wherein: the multi-channel thermal resistance temperature measurement module adopts a six-channel thermal resistance temperature measurement module.
5. The PLC thermal resistance module auto-calibration system of claim 1, wherein: and the PLC main controller is connected with the multichannel thermal resistance temperature measurement module through a PLC internal bus.
6. The PLC thermal resistance module auto-calibration system of claim 1, wherein: and the PLC main controller is connected with the PLC digital quantity output module through a PLC internal bus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359601A (en) * | 2021-07-09 | 2021-09-07 | 上海海得自动化控制软件有限公司 | Automatic calibration system for PLC (programmable logic controller) thermal resistance module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113359601A (en) * | 2021-07-09 | 2021-09-07 | 上海海得自动化控制软件有限公司 | Automatic calibration system for PLC (programmable logic controller) thermal resistance module |
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